Auxiliary Trip Circuit - Danfoss mcd-500 Operating Instruction

5 Application Examples

5.11 Auxiliary Trip Circuit

In normal operation the MCD 500 is controlled via a remote two wire signal (terminals 17, 18).
Input A (terminals 11, 16) is connected to an external trip circuit (such as a low pressure alarm switch for a pumping system). When the external circuit
activates, the soft starter trips, which stops the motor.
5
1 Control voltage (model dependent)
2 24 VDC output
3 Remote control inputs
4 Motor thermistor input (PTC only)
5 Relay outputs
6 3-phase supply
7 Motor terminals
Parameter settings:
• Par. 3-3 Input A Function
• Select Input Trip (N/O) assigns the Input A to Auxiliary Trip (N/O) function
Input A Name
• Par. 3-4
• Select a name e.g. Low Pressure - assigns a name to Input A.
• Par. 3-8 Remote Reset Logic
• Select as required e.g. Normally Closed - the input behaves like a normally closed contact.
44
KM1 F1
1/L1
3/L2
6
5/L3
E
A4
A5
1
A6
07
+
A
08
2
24
VDC
11
S3
16
+
15
17
3
S1
18
25
S2
05
4
06
S1
S2
S3
13, 14
21, 22, 24
33, 34
MG.17.K2.02 - VLT ®
MCD 500 Operating Instruction
2/T1
4/T2
7
6/T3
13
14
21
22
5
24
33
34
Start/stop contact
Reset contact
Auxiliary trip contact
Relay output A
Relay output B
Relay output C
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